Rationale

ASTM F1789 is the terminology standard for mechanical fasteners referenced in F16 standards and other standards such as SAE J429. During the revision to SAE J429, it was necessary to define the following three new terms. In addition, amendments to two existing terms are proposed for improved accuracy and consistency with the new terms. These terms are being re-balloted in consideration of negatives and comments received in a previous ballot. Exceptionally, because the terms are interrelated, they are being balloted together as one ballot item to facilitate review by members of F16.